How to prevent external malicious submission and call the ajax interface in PHP

PHP: how to prevent external malicious submission and call the ajax interface, phpajax. In PHP, how does one prevent external malicious submission and call ajax interfaces? if you use the ajax interfaces written on phpajax's website, define the origin domain name and determine the origin. PHP: how to prevent external malicious submission and call the ajax interface, phpajax

The ajax interface we have written on our own website. if you use it for yourself, you can define the origin domain name and determine the origin.

Note: replace www.jb51.net with your own domain name.

The code is as follows: // determine the origin
If (! Isset ($ _ SERVER ['http _ referer']) |! Stripos ($ _ SERVER ['http _ referer'], 'www .jb51.net ')){
Echo 'canonical' t access ';
Exit ();
}

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Compile the ajax interface written on our website. if you use it for yourself, define the domain name and determine the path ....